Build - moved initializations to `lib/launchServer` and `lib/launchClient`
UI - Two rows of hotkeys for materials
Tools - Add `teleport` and `stairs` to defaults
www - Add peercdn

Just to see what is like
Tools - more defaults to play around with
Deps - move to `kumavis/voxel-client`

-Bumps voxel-engine to 0.18.4
Client - Add `voxel-rescue` to respawn the player back into the world if they fall off
Merged kumavis's latest changes.
Merged changes.